<p>This wiring fixture is provided with a first printed circuit board and a housing that contains said first printed circuit board. The housing is provided with a body and a cover that connect to each other so as to sandwich the first printed circuit board in the thickness direction thereof. The cover has an engagement protrusion that engages with an engagement recess in the body. In an orientation that is off from a correct assembly orientation by 180o about an axis parallel to the thickness direction of the first printed circuit board, the engagement protrusion does not engage with the engagement recess. This prevents the cover from being incorrectly attached to the body in such a manner.</p>
